Rotary pumping machine



June 7, 1927. I HILL ,6 I 32 ROTARY PUMPING MACHINE 5 Sheets-Sheet 1 Filed s p. 1, 1926 Wmmvroze A TTORNE Y E. HILL ROTARY PUMPING MACHINE Filed Sept. 1, 1926 5 Sheets-Sheet 2 June 7, 1927. 1,631,592

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(7 ATTORNEY 19 1631592 June 7,- 27 E. HILL ROTARY PUMPING MACHINE Filed Sept. 1, 1926 5 Sheetu-$heet s ATT.0RNEY 192 June. 7 E. HILL- ROTARY PUMPING MACHINE Filed Sept. 1-,' 1926 s Sheets-Sheet 4 INVENTOR ATTORNE un 7 1927. J e I E. HILL ROTARY PUMPING MACHINE Filed Sept. 1, 1926 5 snets-sneat 5 I 1 INVENTOR 'fi fl m A TT ORNE Y Patented .lime 7,192 7.

UNITED STATES.

OFFICE.

EBENEZER HILL, OF NORTH STAMFORD, CONNECTICUT, ASSIGNOR; TO THE HILL COM- PRESSOR 8a PUMP COMPANY, 01 NEW YORK, N. Y., A CORPORATION OF DELAWARE.

' ROTARY PUMPING momma.

Application filed September 1, 1926. Serial No. 132,941.

This invention relates to a unitary direct connected motor driven rotary pump ng machine, that is, a machine for pump ng air and other gases which has the pump rotor directly connected to and driven by the rotor of an electric motor.

The object of the invention is to so arrange, combine, construct and enclose the pumping and motor elements that a compact machine of this character W111 be pro duced which machine will start easily, thus enabling the.use of a relatively small sized motor, and will run with high efliciency for a long period of time.

This. object is attained by locating the pumping elements of a pump of the internal gear type on the base of an enclosing housing so that they will rotate in a horlzontal plane, the base forming one wall of the pumping chamber, and mounting the motor in the housing directly above the pump with i the motor rotor, that also turns in a horizontal plane, and the pump rotor fixed to the same vertical shaft. Arranged in th1s manner the pump rotor carries the motor rotor and the combined weights of the rotors during operation holds .the pumping elements down to the base and prevents leakage of gas across them. lVhen current is turned on to start the motor there is for a ,moment a slight movement of the motor rotor in an axial direction, and this is utilized to lessen the weight of the parts and relieve the friction of the pump elements against the base, thus enabling the motor to start and obtain speed easily 'and quickly. Lubricant is placed in the housing which encloses both the pump and motor, and means are provided in the housing so that while all of the parts will be automatically lubricated, the discharged gas will be freed of lubricant. p,

In the accompanying drawings 1 shows a vertical section of a gas pumping machine that embodies the invention. Fig.

section of the machine with a modified arrangement for lubricating the parts and sep aratmg the lubricant from the discharged The base 1 of the machine illustrated is a casting of circular outline, and the dome-' connected to the source of supply by passage 7 and pipe 8. An inwardly opening equalizing valve '9 is set in the base between the passage 7 and the chamber 5 to permit the inflow of gas to, but prevent outflow ofgas from this chamber. There is also in the base a chamber 10 into which the pump discharges the pumped gas. A discharge'passage 11 in the base is designed to be connectedby pipe 12 with the receiver for the pumped gas.

The pump illustrated is of the type shown and described in U. S. patent to Hill #1,486,835, granted March 11, 1924, which pump has an internally toothed rotatable driving gear or annulus engaged by an externally toothed rotatable driven gear or pinion, the pinion being mounted within and stud and pinion in order that the latter may rotate freely. The annulus, which in this machine is the pump rotor, is fastened by screws'lS to a disk 19 that forms the head of the vertical shaft 20. The axis of the shaftwhich'carries the annulus and the axis of the stud which retains the pinion are eccentric with relation to each other, as-is necessary in this class of .pumps. The lower end of the shaft is retained in position by a journal bearin 21 supportedby a spider 22 that is secure to the base. At the upper end the shaft is journaled in' a bearing 23 27 (Fig. 6) if desired.

The motor which is illustrated as used in this machine is of the commercial splitphase induction type, but any type of motor may be used. The core 28 of the-motor rotor is fastened to the shaft between the bear ings, and the rotor laminations 29 are" fastened on this core as usual. The field laminations 30 are fastened to the inner wall of the casing 24 and the field coils 31 are wound on these laminations in the approved way.

Mounted on the upper end of the motor rotor core and suitably insulated by the disk 32 are the circuit opening switch brushes 33 that contact with the stationary segments 34 on the insulating sleeve 35 when the rotor is idle, but which under centrifugal action after the rotor starts fly out, as is well known. Binding posts 36 are fastened to the base and connected on the outside to these posts are the service wires 37 (Fig. 1) and on the inside the motor leads 38 (Fig. 2). Ports 39 (Figs. 3 and 5) are made from the intake chamber-5 upthrough the base to the surface 13 which forms one wall of the pumping chamber. These ports are located on the intake side, that is, the side on which the cavities between the teeth of the annulus and pinion open during rotation (Fig. 2). A port40 (Fig. 5) opens from the surface 13 tothe discharge chamber 10. This port is on the discharge side, or the side on which the cavities between the annulus and pinion teeth close (Fig. 2). By the rotation of the pumping parts gas is drawn in through the ports 39 from the chamber 5, and after being compressed is discharged through the port 40 to the chamber 10.

A pipe 41 is led from the discharge chamber to a cavity 42 above the upper end of the shaft so that the gas pumped is delivered from this pipe over the top of the shaft and whatever liquid lubricant the gas contains vizlillf drop and work down and lubricate the s a t.

The upper shaft bearing 23 has a petticoat 43 that extends downward into a cavity .44 in the top of the motor rotor core to prevent the lubricant from being thrown from the shaft onto the motor contacts. A passage 45 is made obliquely downward through the motor rotor core to allow surplus lubricant to drain into the lower part of the housing.

In the form of machine sliown in Fig. 1, the pumped gas passes from above the top of the shaft through openings. 46 into the housing and works its way upward around the outer edges of the solid conical baliie per end into the space in the housing above the baflie plates and that opens at its lower ends into a passage 52 formed in a' plug 55 leads from this passage 52 to the discharge passage 11 so that when the motor is running the pump will draw gas in, through the intake pipe 8 and discharge the gas under pressure and free of lubricant through the discharge pipe 12.

In the form illustrated in Fig. 6 the baflie plates are omitted and the compressed gas is discharged from the pipe 41 directly into the upper part of'the housing. Such liquid lubricant as the discharged gas carries is allowed to flow down around the shaft and be deposited in the bottom of the casing as before described. From the space in the housing the gas under pressure passes screwed into the top'of casing 24. A pipe 53 through the perforations 27 in the shell which supports the motor.casing, and up around the motor parts to the pipe 54 which leads from the top of the casing over the motor, to the discharge passage 11. As the motor rotor turns very rapidly whatever lubricant is contained in the gas that passes through the passage 45 in the motor rotor core is thrown out and separated from the gas by centrifugal action. I

With the machine construction as de scribed when the motor circuit is closed the initial impulse which acts to thrust the motor rotor axially, is employed'to tend to lift the parts and reduce the friction between the pump elements and the surface 13 which forms one wall of the pumping chamber. This reduces resistance to the motor torque so that the motor obtains its speed and power at once. Asthe armature after the first rush of current settles back the weight of the motor rotor, the shaft and the pump rotor holds the pump elements downto the wall 13 of the pump chamber so as to prevent leakage across the faces of the teeth of the annulus and pinion from one cavity to the other. For certain applications this obviates the necessity of providing thrust bearings for the motor and pump, and arranging spring means to hold'the pumping elements in contact with the wall 13, and

tively small size may be employed. As the housing is tight the pump runs in a medium 'as the motor starts freelya motor of rela- "meshing toothed pumping elements eccentric with relation to each other and mounted to rotate in a horizontal plane, a shaft, extending vertically upward from the pump rotor, and an electric motor mounted above the pumping elements with its rotor fixed to said shaft and adapted to rotate ina horizontal plane with its weight transmitted by the shaft to'the pump rotor.

- 2. A pumping machine comprising lntermeshing toothed pumping elements eccentric with relation to each other and mounted to rotate in a horizontal plane, an electric motor mounted above the pumping elements with its rotor adapted to rotate in .a horizontal plane, and a vertically movable shaft connecting the pump rotor and motor r'otor whereby the pump rotor and the motor rotor will rotate and move axially together.

3. A pumping machine comprising intermeshing toothed pumping elements eccentric with relatipn to each other 'and mounted to rotate in a horizontal plane, an electric motor mounted above the pumping elements with its rotor adapted to rotate in a horizontal plane, a vertical shaft connecting the pump rotor and motor rotor, and a houslng enclosing the pump and adapted to hold lubricant, the pump discharge opening into said housing whereb the pump may be operated.

in lubricant un er discharge pressure.

4. A pumpin meshing toothe pumping elements eccentric with relation to each other and mounted to rotate in a horizontal plane, an electric motor mounted above the pumping elements with its rotor adapted to rotate in a horizontal plane, a vertical shaft connecting the pump rotor and motor rotor, and a housing. enclosingthe pump and motor, with the discharge from the pump opening into said housing, whereby the pump and motor are operated in a medium under discharge pressure.

5. A pumpin machine comprising intermeshing toothe [pumping elements eccentric with relation to each other and mounted to rotatein a horizontal plane, an electric motor mounted above the pumping elements with its rotor adapted to rotate in a horizontal plane, a vertical shaft connecting the pump rotor and motor rotor, and a duct from the pump discharge to the upper bearing of said shaft w 6. A pumpin machine comprising intermeshing toothe pumping elements eccentric with relation to each other and mounted to rotate in a horizontal plane, an electric motor mounted above the pumping elements with I rating machine comprising inter-- its rotor adapted to. rotate in a horizontal plane, a vertical shaft connecting the pump rotor and motor rotor, journal bearings for the shaft above and below the motor rotor, a duct from the pump discharge to the shaft above the upper bearing, and passages through the motor rotor below said upper bearing, through which gas passes and oil is separated from it by centrifugal action.

7. A pumping machine comprising intermeshing toothed pumping elements eccen- 1 trio with relation to each other and mounted .to rotate in a horizontal plane, an electric motor mounted above the pumping elements with its rotor adapted to rotate in a horizontal plane, a vertical shaft connecting the pump rotor and motor rotor whereby the pumping elements support the motor rotor bx which they are rotated.

8. pumping machine comprising intermeshing toothed pumping elements eccentric with relation to each other and mounted to rotate in a horizontal plane, an electric motor mounted above the pumping elements with its rotor adapted to rotate in a hori-' zontal plane, a vertical shaft. connecting the pump rotor and motor rotor, a housing enclosing the pump and motor, with the discharge from the pump opening into said housing, and means in the housing for sepaubricant from the gas discharged by the pump.

9. 'A pumping machine comprising intermeshing toothed pumping elements eccentric with relation to each other and mounted to supporting base having a horizontal surface I which forms one wall of the pumping chamber, intermeshing toothed pumping elements mounted to rotate upon said wall, an electric motor mounted above the pumping elements v eccentric with relation to each other and I with its rotor adapted to rotate in a horizontal plane, and a vertical shaft connecting the pump rotor and motor rotor whereby the pumplngelements are rotated by the motor with the horizontal wall of the pum ing chamber by the combinedweights of t ese elements.

'rotor and are retained in sealing contact supporting base having a horizontal surface which forms one wall of the pumping chamber, said base also having an intake chamber and a discharge chamber With ports therefrom through said-horizontal Wall of the pumping chamber, interm eshing pumping elements eccentric With relation to each other mounted to rotate upon said wall. an electric motor mounted above the pumping elements with its rotor adapted to rotate in a horizontal plane, a vertical shaft connecting the pump rotor and-the motor rotor whereby the pumping elements are rotated by the motor rotor and are retained in sealing contact With the horizontal wall of the pumping chamber by the Weight of these elements. v

12. A pumping machine comprising a supporting base having a horizontal surface which forms one Wall of the pumping chamber, said base also having an intake chamber and a discharge chamber with ports therefrom through said horizontal wall of'the pumping chamber, a housing tightly fitted to said base and enclosing intermeshing toothed. pumping elements eccentric with relation to each other mounted to rotate upon said Wall, an electric motor mounted above the pumping elements with its rotor adapted to rotatein a horizontal plane, and a ghaft connecting the pump rotor and the motor rotor.

13. A pumping machine comprising' pumping elements, an electric motor mounted above the pumping elements, a vertical shaft connecting the pump rotor and motor rotor, and a housing enclosing the motorand pump with the pump discharge opening into said housing and both the pump and motor subject to and operating in the discharge pressure. p

15. A pumping machine comprising in-- termeshing toothed pumping elements eccentrio with relation to each. other and mounted to rotate in a. horizontal plane, an electric motor mounted above the pumping elements with its rotor adapted to rotate in a horizontal plane, a rotatory and axially movable shaft connecting the pump rotor and motor rotor, and a housing enclosing the pump and motor.

EBENEZER HILL. 

